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| 型号： | LTM8040EV#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 12/20页 |
| 文件大小： | 0K |
| 描述： | IC LED DRVR HP CONST CURR 66-LGA |
| 产品培训模块： | High Voltage µModule DC/DC Regulators Power Module vs. Discrete DC to DC |
| 产品目录绘图： | LTM Series_15x15x4.3 |
| 设计资源： | LTM8040 Spice Model LTM8040 Gerber Files |
| 特色产品： | μModule Products DC/DC μModule Regulator Family |
| 标准包装： | 170 |
| 系列： | µModule® |
| 输入电压： | 4 ~ 36 V |
| 输出电压： | 2.5 ~ 13 V |
| 电流 - 输出： | 1A |
| 功率（瓦特）： | 13W |
| 安装类型： | 表面贴装 |
| 端接类型： | 表面安装 (SMD，SMT) |
| 尺寸/尺寸： | 0.59" L x 0.35" W x 0.17" H（15.0mm x 9.0mm x 4.3mm） |
| 工作温度： | 0°C ~ 125°C |
| 类型： | 降压，带调光 |
| 产品目录页面： | 2711 (CN2011-ZH PDF) |
LTM8040
APPLICATION INFORMATION
I RATIO =
= 10:1
PWM RATIO =
= 250:1
= PWM RATIO
PWM dimming control (Figure 5) uses the PWM pin and
an external NFET tied to the cathode of the LED. When the
PWM signal goes low, the NFET turns off, disconnecting
the LED from the internal current source and “freezing”
the state of LTM8040 internal control and drive circuitry,
but leaving the output capacitor of the internal step-down
converter charged. When the PWM pin goes high again,
the LED current returns rapidly to its previous on state.
This fast settling time allows the LTM8040 to maintain
LED current regulation with PWM pulse widths as short
as 40μs. It is also possible to not use an external NFET,
but the output capacitor of the internal regulator will be
discharged by the LED(s) and have to be charged up again
when the current source turns back on. This will lengthen
the minimum dimming pulse width.
The maximum PWM dimming ratio (PWM RATIO ) can
be calculated from the maximum PWM period (t MAX )
and minimum PWM pulse width (t MIN ) as follows:
t MAX
t MIN
Totaldimmingratio(DIM RATIO )istheproductofthePWM
dimming ratio and the current dimming ratio.
PWM
60Hz TO
10kHz
Example: I MAX = 1A, I MIN = 0.1A, t MAX = 10ms,
t MIN = 40μs
1A
0.1A
10ms
40μs
DIM RATIO = 10 ? 250 = 2500:1
Minimum Input Voltage
The LTM8040 is a step-down converter, so a minimum
amount of headroom is required to keep the output in
regulation. For most applications at full load, the input
needs to be at least 1.5V above the desired output. In
addition, it takes more input voltage to initially start than
is required for continuous operation. This start voltage is
also dependent on whether turn-on is controlled by the
LTM8040’s SHDN pin or UVLO (that is, the SHDN pin is
tied to V IN ). See Typical Performance Characteristics for
details.
PWM
LTM8040
LEDA
GND
8040 F05
Figure 5. Dimming Using PWM Signal
8040fa
12
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTM8040IV#PBF | 功能描述:IC LED DRVR HP CONST CURR 66-LGA RoHS:是 类别:电源 - 板载 >> LED 驱动器 - 恒定电流 系列:µModule® 产品目录绘图:4015, 7021 Series 标准包装:25 系列:7021 BuckPlus 输入电压:5 ~ 32V 输出电压:2.5 ~ 29.5V 电流 - 输出:700mA 功率（瓦特）:22.4W 安装类型:通孔 端接类型:PCB 引脚 尺寸/尺寸:0.83" L x 0.83" W x 0.43" H（21.1mm x 21.1mm x 10.9mm） 工作温度:-40°C ~ 80°C 类型:降压，带调光 批准:- 其它名称:788-1018 |
| LTM8040IV#PBF | 制造商:Linear Technology 功能描述:DC/DC MICRO MODULE IC |
| LTM8040IVPBF | 制造商:Linear Technology 功能描述:LED Driver 1A 36V Current Source LGA66 |
| LTM8040IV-PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:36V, 1A μModule LED Driver |
| LTM8040V | 制造商:LINER 制造商全称:Linear Technology 功能描述:36V, 1A μModule LED Driver |
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